"Our brains are masterful meaning makers," said John Zavodny, a philosopher at Unity College in Maine. "This is what we do. This is how we have survived as long as we have without seriously big claws or big teeth. ... We've lasted because we saw meaning in everything."

(John Alvin/The Fresno Bee 2008)
(John Alvin)

That can protect us. "When I am hiking, I see snakes everywhere," he said. "There's a twig; it's a snake. I'm never right about it -- maybe once every 100 times it is a snake."

But, he adds, "it does me no damage to make meaning in these circumstances. ... If I'm wrong and I see a snake and I think it's only a twig and I get bitten, I'm dead."

When the worst doesn't happen, it can reinforce our belief that we've somehow warded off calamity.

Simon Rego, a cognitive behavioral psychologist in New York, calls this a "type of information processing bias."

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"If you walk out of your office and say, 'Let me pay attention to all the things that go wrong,' it skews the way you see your day," he said. We are "filled every day with information that gives us joy and sorrow, stress and pleasure," Rego added. The kind of day you have largely depends on "the overarching philosophy of how we approach the day."

Travelers also might think about ingrained but unspoken issues surrounding time off.

"The reason things seem to go wrong before people take a vacation is because unconsciously they are fearful that they are wasting time and money, and that they will miss out on opportunities while they are gone," said Dr. Carole Lieberman, a psychiatrist on the clinical faculty at UCLA's Neuropsychiatric Institute.

So before you pack your bags or step foot on the plane or get in the car, try putting your brain on vacation -- a vacation from making meaning, from seeing ill, from manifesting doubts.

"What do you think of the world?" William James asks in "The Will to Believe and Other Essays in Popular Philosophy." "These are questions with which all must deal as it seems good to them. They are riddles of the Sphinx, and in some ways or other, we must deal with them. In all important transactions of life, we have to take a leap in the dark. ... If we decide to leave the riddles unanswered, that is a choice; if we waver in our answer, that, too, is a choice. But whatever choice we make, we make it at our peril."